Telegraph receiving instrument



V Ma 3 1927.

y R. A. GRouT TELEGRAPH RECEIVING INSTRUMENT Filed Jan. 5, 1925 (g1/Lumi? attenua? NJ A `Patented May `3, 1927.

' UNITED y`srivrizs .RANSOM ALBERT GROUT, F SAN BRUNO, CALIFORNIA.

TELEGRAPH RECEIVING INSTRUMENT.

Application filed January This invention relates to a telegraph receiving instrument,which has been perfected with the object oi? amplifying the sound thereof by means et a simple and inexpensive device, which is reliable and efficient and easily actuated. The present construction embodies sonic of the 'features shown in U. S. Patent 1,066,410, issued to me July l, 1913, but some oil the'more cumbersome parts ot the latter have been eliminated, and

other improvements havebeen effected with the result that the present instrument is more compact and serviceable, and 'is capable of finer and readier ustirrent.

'The specific construction of the invention and the advantages thereof will be more 'fully explained in the following detailed description, which isl to be read `in connection with `the accompanying drawing, illustrating the' same in its preferred vform.

In the drawing: Figure 1 is a side elevation of the invention with partsl thereof broken away and shown in section. i Figure 2l isa vertical longitudinal section through the front part of the instrument.

` Figure 3 lis a transversescction taken on the line 3-3 of Figurey 2.

Figure 4 is a transverse section taken on the line 4 4 of Figure 2. j

` Figure 5 .is a sectiontaken on substantially the same plane as Figure 3, but looking in the opposite ydirection as indicated by the arrows 5-5 in Figure 2. `The instrui'nent, constituting the subject matter ot the invention, comprises a magnet 10, ot the usual construction, mounted tor longitudinaladjustment in a sleeve 11, which is clamped in abracket 12 secured to a suitable base 13. Binding posts 14 are secured to the rear end of the base 13, and are operatively connected by -wires 15 to the magnet 10.

A cap 16 is secured to the rear end of the sleeve 11, andthe core 17 of the magnet hasa threaded stem 18 secured to its rear end and extending rearwardly through a central orifice in the cap 16, and through a bore in the upper end of a post 19, which is secured to the base v13.` A coiled spring 20 surrounds the stem and bears against the rear end of the core 17, and the longitudinal adjustment of the magnet is determined by means oii an adjusting nut 21 and a lock nut`22 mounted on the threaded end ot' the stem 18. The front end of the sleeve 5, 1926. Serial N0. 79,372.

11 is threaded to receive an annular head 23 to which a diaphragm holder 24 is secured by means of clamping plates 25. The periphery of the diaphragm h older has an inturned flange 26, beneath which are secured two rings or washers 27 with the diaphragmi 28 between them. The front cover platey29 is also secured beneath the flange 26, and has a forwardly,extendingcollar 30 secured centrally thereof, and constituting a bearlug to receive the rearwardly extending neck 31 of the horn 32. The central portion of the diaphragm 28 is cut away to receive a collar 33, having at its rear end an annular head 34 constituting an anvil, the collar being externally threaded to receive a clamping nut 35. Suitable clamping rings or washers 36 are mounted on the collar 33, and cooperatewith they nut and head 34 to clamp the anvil rigidly to the center of the diaphragm, so that the sound of any blow received by the anvil will be transmitted directly to the diaphragm and will be emitted from the horn 32.

The inner portions of the plates 25 are turned rearwardly, as shown at 37, to provide a space for the sounding element which delivers the strokes to the anvil 33. This sounding element comprises a rectangular head 38 secured to the end of a non-circular sten'1`39, which is guided centrally of thediaphragm 28 and perpendicular thereto by a guideway 40 supported by arms 41, which are secured yto the inside of the collar 30. The stem 39 extends beyond the non-circular portion in the form of a threaded spindle 42, on which Ais mounted an adjustable nut 43 and lock nut 44, which adjustably limit the strokey of the sounding element 38, and also serve to counterbalance the same.

The sounding element 38 acts as an arma* ture for the core 17 of the magnet, and is actuated in one direction by the magnet, and in the other direction by a'coiled spring 45. This spring is connected at one' end to the spindle 42, and at the other end to a pin 46, which is swivelled in a screw 47 mounted in the outer end of a bracket 48 secured to and extending forwardly from the collar 30. The screw 47 may be adjusted to vary the tension of the spring 45, and may be secured in adjusted position by a lock nut 49. 1 The major adjustment of the magnet 10 may be eiiected by a manipulation of the nuts 21 and 22, and a liner adjustment may ico 'ZIO

be etlecled by rotating the head Q3 on the sleeve lll, thereby moving the diaphragm and anvil toward or from the magnet. rlhe length ot strolre ot the sounding element is regulated by means ot the nuts 4l?) and fill. The tension of the spring lo is varied by means ot the e ew l? and lock nut 49. All or" these atfljustments may be made with one hand, while the oher hand is free to work the ltey.

A further and important advantage ot the present construction is the manner in which the blow ot the sounder is delivered, and the manner in which the sound is transmitted and amplifiery by he diaphragm and horn. The anvil Sil is secured in direct and rigid contact with the diaphragm, and the soundingelement "D is balanced and guided, so

DO that it has a tree and easy rectilinear movement to vard and from the anvil. By delivering the blow in exactly the center of the diapl'iragm and directly on the anvil, sound produced by the instrinncnt is unich louder, operates with less current, and is capable ot' much finer adjustment.

Vi'hile l have shown the invention in connection with only one magnet, it is, ot course, to be understood that two magnets may be used ii desired without any material change in the construction ot the sounder and amplifier lt is apparent that various modifications may be made in the details oil construction and the arrangement of the same without any material departure trom the salient l'eatures of the invention as claimed.

lillhat is claimed is:

1. ln a telegraph receiving instrument, the combination ot' a magnet, a diaphragm mounted in tront ot the magnet, an anvil secured centrally to the diaphragm, and a sounding element acting as an armature and guided t'or rectilinear movement between the anvil and the core Ot the magnet.

ln a telegraph receiving instrument, the combination of a magnet, a diaphragm mounted in front ot the magnet, an anvil secured Centrally to the diaphragm, a reciprocable sounding element acting as an armature, and means for supporting said element independently ot the diaphragm and tor guiding it rectilinearly between the an 'il and the core ot the magnet.

3. ln a telegraph receiving` instrument, the combination ot a casing, a magnet mounted within the casing, a diaphragm in Jfront oit said magnet, a horn extending torwardly in trout ot' the diaphragm, an anvil secured centrally ot the diaphragm, a sound ing element guided for rectilinear movement between the anvil and the core ot' the mag net. a bracket secured to the neck ot the horn., a pin located centrally oit' the horn and secured to the bracket, and resilient means connected with the pin and cooperating with the magnet to reciprocate the sounding element.

lu a telegraph receiving instrument, the combination olf a magnet, a diaphragm mounted in iront ot the magnet and having an (mening through its center, a collar sccured to the edge oit said opening' and hav- .ing` a iiange constituting an anvil on the side toward the magneti, and a sounding element guided ior movement between the anvil and the core o i' the magnet.

ln a` telegraph receiving instrument, the combination oi a magnet, a diaphragm mounted in `troni ot the magnet and having an openingl through its center, a collar secured to the edge ot said opening and having a flange constituting an anvil on the side toward the magnet. a guide member located centrally oit the collar and perpendicular to the diaphragm, means supporting said guide member so that it is not in contact with either the diaphragm or the collar, and a sound ,j clement supported tor reciprocation by said guide member and liavingl a head which` moves between the anvil and the core ot the magnet.

6. ln a telegraph receiving instrument, the combination ot' a magnet, a diaphragm mounted in lront ot the magnet and having an opening through its center, a collar secured to the edge of the opening and having a flange constituting an anvil on the side toward the magnet, a guide member located centrally oit the collar and perpendicular to the plane of the diaphragm, a stem mounted tor reciprocation in said guide member, a head secured to one end i the stem and constituting an armature, and sounding element which is movable between the anvil and the core of the magnet, and a nut secured to the other end ot the stem and counterbalancing the head, said nut being adjustable to adjust the length of stroke of the sounding element.

7. ,ln a telegraph receiving instrument, the combination of a casing, a magnet mounted within the casing, a diaphragm in trout ot the magnet, an anvil secured centrally of the diaphragm, and a sounding element having a shank guided for rectilinear movement centrally ot the diaphragm and perpendicular thereto and having a head adapted to strike the anvil and the core of the magnet alternately.

8. In a telegraph receiving instrument, the combination ot a casing, a magnet mounted within the casing, a diaphragm in 'front ot said magnet and having a central openingtherethrough, a collar secured to the diaphragm around said central opening and constituting an anvil, a reciprocable soundingelement between the anvil and the core ot the magnet, said sounding element having a shank extending through said anvil centrallj,7 of the diaphragm, and means for independently supporting said element out of contact with the diaphragm and anvil and for guiding it rectilinear-ly, so that the sounding element reciprocates between the ,anvil and the core of the magnet.

9. In a telegraph receiving instrument, the combination of a casing, a magnet mounted within the casing, a: diaphragm holder connected with the front end ott the casing, a diaphragm clamped in said holder, a horn supported by said holder and extending forwardly in :lront of the diaphragm, an anvil secured centrally of the diaphragm, a sounding element having a shank guided for movement centrally of the diaphragm and perpendicular thereto and Jhaving a head adapted to strike the anvil and the core of the magnet alternately, and means supported centrally of the horn and cooperating with the magnet to reciprocate said sounding element.

10. In a telegraph receiving instrument, the combination oi' a cylindrical casing, a magnet mounted within the casing, a diaphragm in front of said magnet, a holder for the diaphragm having a screw threaded connection with the casing, whereby to adjust the distance between the diaphragm and the magnet, said diaphragm having an open- 11. In a telegraph receiving instrument,

the combination of a cylindrical casing, a magnet mounted within the casing, a diaphragm in, front of said magnet, a holder lor the diaphragm having a s'crew threaded connection with the casing whereby to adjust the distance between the diaphragm and magnet, said diaphragm having an opening through its center, a collar'secured to the edge of said opening and having a flange constituting an anvil, a guide member located centrally of the collar and perpendicular to the plane of the diaphragm, a sounding element supported for reciprocation by said guide member and having a head kwhich moves between the anvil and core of the magnet, and means cooperating with the magnet l'oi actuating said sounding element.V

In testimony, that I claim the foregoing as my own, I have hereto aixed my signature. l

RANSOM'ALBERT GROUT. 

